The cooler weather alerts pests, including rodents, to seek out warm shelter for the winter months. You might already be experiencing this with ladybugs, box elder bugs or stink bugs trying to get indoors, so it is important to try to figure out where they may be coming in or where they could come in to your house. Check especially around windows and doors, near utility access points, and even in cracks or gaps in siding, and fix these access points accordingly.